期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 639, 期 -, 页码 1432-1439出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.05.250
关键词
Activated carbon; Adsorption; Ammonium; Anionic surfactant; Modification
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2018R1A1A1A05020659]
- Korea Environmental Industry & Technology Institute (KEITI) through Public Technology Program based on Environmental Policy - Korea Ministry of Environment (MOE) [2016000200008]
This study investigates the effect of anionic surfactant modification on activated carbon (AC) to enhance the adsorption of ammonium ion in aqueous solution. Sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS) or sodium octanoate (SO) was used for the modification. At the initial aqueous concentration of 55 mg NH4-N/L and the adsorbent dose of 50 g/L, the SDS-modified AC showed the highest ammonium removal efficiency of 82% among the modified ACs studied. The hydrophobic group of SDS was strongly attached to AC showing almost negligible desorption after the modification. At the same time, the sulfate functional group of SDS provided ion exchange sites favorable for the ammonium ion adsorption. By maximizing SDS loading to the AC, ammonium removal efficiency can further be improved (5% increase). When Na+, K+ or Ca2+ coexisted in the ammonium solution at the concentration of 55 mg/L, the inhibition effect of these cations on ammonium removal efficiency was negligible (< 5%). This study shows the potential of anionic surfactant-modified ACs as the excellent adsorbents for ammonium removal from water. (C) 2018 Elsevier B.V. All rights reserved.
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